TWI677182B - Optimized input and output power control solar power supply device and equipment - Google Patents

Abstract

An optimized input and output power control solar power supply device includes a plurality of optimized input and output power control solar power devices respectively suitable for electrically connecting a plurality of solar panels and connected in parallel with each other. Each solar power device includes a switching circuit and a voltage conversion. Circuit, an output interface, and a control unit. The switch circuit has an input terminal for receiving an input voltage and an input current of a corresponding solar panel, and an output terminal. The voltage conversion circuit receives the input voltage and the input current and outputs them as an output voltage and an output current. The control unit calculates an input power and an output power, and adjusts the conduction time and non-conduction time of the input terminal and the output terminal according to the value of the input power and the value of the output power, respectively, to obtain the optimized input power. And the output power. Thereby, the overall power generation efficiency can be optimized.

Description

Optimized input and output power control solar power device and equipment

The invention relates to a green energy power supply device and equipment, in particular to a solar power supply device and equipment for optimizing input and output power control.

Due to the limitation of petroleum energy, in recent years, green energy power generation technology has developed rapidly. Among them, solar power generation has become one of the main development technologies due to clean, pollution-free and easy to obtain factors.

Referring to FIG. 1 and FIG. 2, a solar power generation device is known, which includes a plurality of solar panels 11 and a power supply device 12. The power supply device 12 has a voltage conversion circuit 121 and obtains a higher output voltage by connecting the solar panels 11 in series. However, if there is an aging failure solar panel 11 in the series path (such as a broken solar panel at the bottom right) 111), it will cause the circuit to open and fail to operate normally, or a part of the solar panel 11 as shown in Fig. 1 is blocked by tree shadow 112, bird droppings and other pollutants 113, resulting in low power generation efficiency (lower output power generation current) ), The overall current will be pulled down by the solar panel 11 with low power generation efficiency, resulting in poor overall power generation efficiency.

In order to solve the above problems, the power supply device 12 is developed as shown in FIG. 3. Parallel method, however, similarly, when the solar panel 11 with aging failure or a part of the solar panel 11 is shaded and the power generation efficiency is low (lower output voltage), the overall output voltage will be caused. Being pulled down, resulting in poor overall power generation efficiency.

Referring to FIG. 1 and FIG. 4, in order to solve the problem that the solar panel 11 with low power generation efficiency drags down the overall power generation efficiency, the power supply device 12 develops a method as shown in FIG. 4, firstly connecting each solar panel 11 in series with a diode. After 122, the parallel connection is performed. In this way, by the characteristics of the diode 122 itself, the solar panel 11 with low power generation efficiency (lower voltage) is automatically disconnected, so that the solar panel 11 with low power generation efficiency does not pull down the overall voltage. However, when most of the solar panels 11 are shaded or only a few solar panels 11 generate high voltage, it will result in a higher proportion of solar panels 11 being disconnected without providing power. In this way, the overall power generation efficiency will be too low because too many solar panels 11 are left vacant.

Therefore, an object of the present invention is to provide an optimized input and output power control solar power device capable of improving power generation efficiency.

Therefore, the present invention optimizes the input and output power control solar power device, which is suitable for electrically connecting a solar panel for providing an input voltage and an input current, and includes a switch circuit, a voltage conversion circuit, an output interface, and A control unit.

The switching circuit is suitable for receiving the input voltage and the input current and outputting, and includes an input terminal electrically connected to the solar panel and adapted to receive the input voltage and the input current, and an output terminal.

The voltage conversion circuit receives the input voltage and the input current from the output terminal of the switching circuit and converts the voltage to an output voltage and an output current.

The output interface is electrically connected to the voltage conversion circuit and receives the output voltage and the output current.

The control unit detects the input voltage, the input current, the output voltage, and the output current, and calculates an input power related to a product of the input voltage and the input current and a product related to the output voltage and the output current. And adjust the conduction time between the input terminal and the output terminal according to the value of the input power, and adjust the non-conduction time between the input terminal and the output terminal according to the value of the output power to obtain the optimized input power and The output power.

The effect of the present invention is that by controlling the control unit to adjust the conduction time between the input terminal and the output terminal according to the value of the input power, and adjusting the non-conduction time between the input terminal and the output terminal according to the value of the output power, the best can be achieved. The input power and the output power are optimized so as to optimize the overall power generation efficiency.

20‧‧‧ Self-adjusting solar power device

2‧‧‧Switch circuit

21‧‧‧input

22‧‧‧output

3‧‧‧Voltage Conversion Circuit

31‧‧‧diode

54‧‧‧Overcurrent protection circuit

6‧‧‧Control unit

61‧‧‧Control circuit

62‧‧‧Output current detection circuit

63‧‧‧Output voltage detection circuit

8‧‧‧ solar panel

32‧‧‧Inductance

33‧‧‧Capacitor

4‧‧‧ output interface

5‧‧‧ protection unit

51‧‧‧input capacitor

52‧‧‧output capacitor

53‧‧‧Lightning protection circuit

9‧‧‧ load

Vi‧‧‧ input voltage

Vo‧‧‧ output voltage

Ii‧‧‧Input current

Io‧‧‧Output current

Wi‧‧‧ input power

Wo‧‧‧ Output Power

Other features and effects of the present invention will be described with reference to the embodiments of the drawings. 1 is a schematic diagram of a plurality of solar panels of a conventional solar power generation device; FIG. 2 is a schematic circuit diagram of the solar power generation device; FIG. 3 is a schematic circuit diagram of another solar power generation device; 4 is a schematic circuit diagram of a conventional third type of solar power generation equipment; FIG. 5 is an application schematic diagram of an embodiment of optimizing input and output power control solar power equipment of the present invention; and FIG. 6 is an optimization of the embodiment A schematic circuit diagram of an input-output power control solar power device in application; and FIG. 7 is a control signal, an input voltage, an input current, and an input power of the optimized input-output power control solar power device of the embodiment. , A waveform diagram of an output voltage, an output current, and an output power.

Referring to FIG. 5, FIG. 6 and FIG. 7, an embodiment of the present invention for optimizing input and output power control solar power equipment is suitable for electrically connecting a plurality of solar panels 8. The input current Ii, the optimized input and output power control solar power device includes a plurality of optimized input and output power control solar power devices 20.

The optimized input and output powers control the solar power devices 20 in parallel with each other. And are respectively suitable for electrically connecting the solar panels 8, each of the optimized input and output power control solar power devices 20 includes a switch circuit 2, a voltage conversion circuit 3, an output interface 4, a protection unit 5, and A control unit 6.

Among them, it is worth mentioning that since the optimized input and output power control solar power supply device 20 is electrically connected to the solar panel 8 one by one, it can only have a single optimized input when it is actually sold and used. The combination of the output power control solar power device 20 and a single solar panel 8 can be used by a user for single group purchase or multiple group purchases before assembly.

The switching circuit 2 is adapted to receive and output the input voltage Vi and the input current Ii, and has an input terminal 21 electrically connected to the solar panel 8 and adapted to receive the input voltage Vi and the input current Ii, and an output terminal 22 The switch circuit 2 is controlled by a control signal to switch between the input terminal 21 and the output terminal 22 between conducting and non-conducting.

The voltage conversion circuit 3 receives the input voltage Vi and the input current Ii from the output terminal 22 of the switching circuit 2 and converts the voltage to an output voltage Vo and an output current Io. The voltage conversion circuit 3 can be a step-down circuit and has a diode 31, an inductor 32, and a capacitor 33. However, its implementation and circuit components can be changed according to actual needs. This is limited.

The output interface 4 is electrically connected to the voltage conversion circuit 3 and receives the output voltage Vo and the output current Io.

The protection unit 5 has an input capacitor 51 connected in parallel to the solar panel 8, an output capacitor 52 connected in parallel to the output interface 4, a lightning protection circuit 53 connected in parallel to the solar panel 8, and an electrical connection to the voltage converter. An overcurrent protection circuit 54 between the circuit 3 and the output interface 4 and configured to detect the output current Io.

The control unit 6 has a control circuit 61 that outputs the control signal, an output current detection circuit 62 and an output voltage detection circuit 63 that are electrically connected to the output interface 4.

The control circuit 61 detects the input voltage Vi, the input current Ii, the output voltage Vo, and the output current Io, and calculates an input power Wi related to a product of the input voltage Vi and the input current Ii and a value related to the The output power Wo, which is the product of the output voltage Vo and the output current Io, is used to adjust the on-time of the input terminal 21 and the output terminal 22 according to the value of the input power Wi. The input terminal 21 and the output terminal Wo are adjusted according to the value of the output power Wo. The non-conduction time of the output terminal 22 to obtain the optimized input power Wi and the output power Wo.

The control circuit 61 calculates the input power Wi during the conduction period between the input terminal 21 and the output terminal 22, and controls the input terminal 21 and the output when the change trend of the value of the input power Wi changes from increasing to decreasing. The terminals 22 are switched off.

該控制電路61於該輸入端21與該輸出端22的不導通期間，運算該輸出功率Wo，並於該輸出功率Wo的值的變化趨勢由增加轉為減少時，控制該輸入端21與該輸出端22間切換為導通。 The control circuit 61 calculates the input power Wi with the following formula every unit time, where t is the sampling time and T is the unit time:

The control circuit 61 calculates the output power Wo during the non-conducting period between the input terminal 21 and the output terminal 22, and controls the input terminal 21 and the output power when the value of the output power Wo changes from increasing to decreasing. The output terminals 22 are switched on.

其中，於本實施例中，於該開關電路2的導通期間及不導通期間，該控制電路61皆是間隔相同的單位時間進行運算，但也能是間隔不同的單位時間進行運算，並不限於此。 The control circuit 61 calculates the output power Wo by the following formula every unit time:

Wherein, in this embodiment, during the conducting period and the non-conducting period of the switching circuit 2, the control circuit 61 performs calculations at the same unit time interval, but can also perform calculations at the unit time different intervals, which is not limited this.

When the lightning protection circuit 53 detects a surge higher than a surge value, the control circuit 61 controls the input terminal 21 and the output terminal 22 of the switch circuit 2 to be non-conductive.

The control circuit 61 controls the input terminal 21 and the output terminal 22 of the switch circuit 2 to be non-conductive when the overcurrent protection circuit 54 detects that the output current Io is higher than an overcurrent value.

The output current detection circuit 62 and the output voltage detection circuit 63 are respectively used to detect the output current Io and the output voltage Vo and output detection results to the control circuit 61.

In practical applications, each solar panel 8 is equipped with an optimized input and output power control solar power device 20, and each optimized input and output power controls solar power. The power supply devices 20 are connected in parallel with each other and are electrically connected to a load 9.

When the control signal is switched to a high level, the switch circuit 2 is turned on. At this time, due to the influence of the inductor 32, the input current Ii will start to continuously rise, and the input voltage Vi will slowly decrease, so that the input power Wi appears. For a continuously rising waveform, when a certain critical point is reached, the input voltage Vi will drop to change the input power Wi from increasing to decreasing. At this time, the control unit 6 controls the switching circuit 2 to switch to non-conducting. .

Then, during the non-conducting period, the output voltage Vo will continue to rise, and the output current Io will slowly decrease, so that the output power Wo will show a continuously rising waveform. Similarly, at a certain critical point, the output current Io will drop to The change trend of the output power Wo is changed from increasing to decreasing. At this time, the control unit 6 controls the switching circuit 2 to be switched on.

Thereby, the output of the input power Wi and the output power Wo can be increased to the maximum value, and thus the optimized input power Wi and the output power Wo can be obtained.

Wherein, in FIG. 7, the total area of the input power Wi is positively related to the sunlight, the input voltage Vi, and the input current Ii. The total area of the output power Wo is related to the output voltage Vo, and the The magnitude of the output current Io (related to the load change) is positively correlated.

When the optimized input and output power is controlled by the solar power supply device 20, When the connected load 9 is removed and is in the no-load state, since the optimized input and output power control solar power device 20 is still maintained in a parallel state at this time, an optimized input capable of outputting a higher output voltage Vo The output power control of the solar power supply device 20 will optimize the output of the lower output voltage Vo. The input and output power control of the solar power supply device 20 will recharge the current and cause unnecessary loss of the internal power supply. In order to avoid such a phenomenon, the control The circuit 61 performs control and is explained as follows: Since the voltage conversion circuit 3 of each of the optimized input and output power control solar power devices 20 in this embodiment is a step-down circuit, the output voltage Vo will be pulled when no-load High to approach the input voltage Vi, and when connected to the load 9, it will be pulled down to the required operating voltage by the load 9, therefore, a high predetermined value closer to the input voltage Vi can be set in advance, and A low predetermined value closer to the operating voltage, when the output voltage Vo is greater than the high predetermined value, the control circuit 61 determines that there is currently no load 9, and controls the switching circuit 2 The input terminal 21 and the output terminal 22 are not connected to stop outputting the power of the solar panel 8 to avoid internal loss. When the output voltage Vo is less than the low predetermined value, the control circuit 61 determines that the load 9 is currently connected. Therefore, the input terminal 21 and the output terminal 22 of the switch circuit 2 are controlled to be re-conducted to output the power of the solar panel 8 again.

Through the above description, the advantages of this embodiment can be summarized as follows:

First, the control unit 6 adjusts the conduction time between the input terminal 21 and the output terminal 22 according to the value of the input power Wi, and adjusts the time according to the value of the output power Wo. The non-conduction time between the input terminal 21 and the output terminal 22 can obtain the optimized input power Wi and the output power Wo, so as to optimize the overall power generation efficiency.

Furthermore, since the optimized input and output power control solar power supply device 20 is electrically connected to the solar panel 8 one-to-one, compared with the conventional technology, a power supply device is used to electrically connect a plurality of solar panels. The circuit design of the device is more complicated and the power load is larger. In this case, a simpler and lower power load circuit design can be used. With a one-to-one modular design, it can be sold in a single group while taking into account the demand for solar energy. Fewer consumer groups and greater convenience in assembly, maintenance and replacement.

Second, when the control unit 6 changes the value of the input power Wi from increasing to decreasing, controlling the input terminal 21 and the output terminal 22 to switch to non-conducting and the value of the output power Wo When the change trend is changed from increasing to decreasing, controlling the input terminal 21 and the output terminal 22 to switch to conduction can increase the output of the input power Wi and the output power Wo to the maximum value, and optimize the overall power generation efficiency.

3. The output voltage detection circuit 63 is set in the solar power supply device 20 due to each optimized input and output power control, and is matched with the control circuit 61 to control the switch circuit 2 when the output voltage Vo is greater than the high predetermined value. The input terminal 21 and the output terminal 22 are not conductive, and when the output voltage Vo is less than the low predetermined value, controlling the re-conduction between the input terminal 21 and the output terminal 22 of the switching circuit 2 can avoid such problems. Optimize the input and output power control. The solar power supply device 20 recharges each other when it is not connected to the load 9 and causes unnecessary loss of internal power. It can also be connected to the load 9 It automatically resumes normal operation afterwards, so it has the effect of reducing power loss and convenience.

4. The lightning protection circuit 53 and the overcurrent protection circuit 54 are provided in each of the solar power supply devices 20 for controlling the optimized input and output power to protect the solar panel 8. The optimized input and output power controls the solar power device 20 to avoid lightning surge and overcurrent damage, increase product life.

5. By setting the input capacitor 51 and the output capacitor 52 in the solar power device 20 for each optimized input and output power control, the ripple conditions of the input voltage Vi and the output voltage Vo can be reduced to achieve better stability.压 效应。 The effect.

In summary, the purpose of the invention can be achieved.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application and the contents of the patent specification of the present invention are still Within the scope of the invention patent.

Claims (9)

An optimized input and output power control solar power source device is suitable for electrically connecting a solar panel for providing an input voltage and an input current, and includes a voltage conversion circuit and an output interface. The characteristics are: the optimization The input and output power control solar power device further includes a switch circuit and a control unit; the switch circuit is adapted to receive the input voltage and the input current and output, including an electrical connection to the solar panel and adapted to receive the input voltage and the input An input terminal for current, and an output terminal; the voltage conversion circuit receives the input voltage and the input current from the output terminal of the switching circuit and converts the voltage to output an output voltage and an output current; the output interface is electrically connected to the The voltage conversion circuit receives the output voltage and the output current; the control unit detects the input voltage, the input current, the output voltage, and the output current, and calculates an input power related to a product of the input voltage and the input current And an output related to the product of the output voltage and the output current Rate, and adjust the conduction time between the input terminal and the output terminal according to the value of the input power, and adjust the non-conduction time between the input terminal and the output terminal according to the value of the output power to obtain the optimized input power and the output power. The optimized input and output power control solar power device according to claim 1, wherein the control unit calculates the input power during a conduction period between the input terminal and the output terminal, and a change trend of the value of the input power is determined by When increasing to decreasing, the input terminal and the output terminal are controlled to be switched off. The optimized input and output power control solar power device according to claim 2, wherein the control unit calculates the input power with the following formula every unit time: Among them, Wi is the input power, Vi is the input voltage, Ii is the input current, t is the sampling time, and T is the unit time. The optimized input and output power control solar power device according to claim 1, wherein the control unit calculates the output power during a non-conduction period between the input terminal and the output terminal, and calculates a change trend of the value of the output power When changing from increasing to decreasing, the input terminal and the output terminal are controlled to be turned on. The optimized input and output power control solar power device according to claim 4, wherein the control unit calculates the output power by the following formula every unit time: Among them, Wo is the output power, Vo is the output voltage, Io is the output current, t is the sampling time, and T is the unit time. The optimized input and output power control solar power device according to claim 1, wherein the control unit includes a control circuit, an output current detection circuit and an output voltage detection circuit electrically connected to the output interface, and the output The current detection circuit and the output voltage detection circuit are respectively used to detect the output current and the output voltage and output detection results to the control circuit. The optimized input and output power control solar power device according to claim 6, wherein the control circuit controls the input terminal and the output terminal of the switching circuit to be non-conductive when the output voltage is greater than a high predetermined value, When the output voltage is less than a low predetermined value, the input terminal and the output terminal of the switching circuit are controlled to be re-conducted. The optimized input and output power control solar power device according to claim 7, further comprising a lightning protection circuit connected in parallel to the solar panel, and the control unit detects that the lightning protection circuit is higher than a surge value During a sudden surge, the input terminal and the output terminal of the switching circuit are controlled to be non-conductive. An optimized input and output power control solar power source device is suitable for electrically connecting a plurality of solar panels, and each solar panel is used to provide an input voltage and an input current; the characteristics are: the optimized input and output power control solar power source device Including a plurality of optimized input and output power control solar power devices; the optimized input and output power control solar power devices are connected in parallel with each other, and are respectively suitable for electrically connecting the solar panels, and each optimized input and output power control solar power source The device includes a switch circuit, a voltage conversion circuit, an output interface, and a control unit; the switch circuit is suitable for receiving the input voltage and the input current and outputting, and has an electrical connection to the solar panel and is suitable for receiving the input voltage And an input terminal of the input current, and an output terminal, the voltage conversion circuit receives the input voltage and the input current from the output terminal of the switching circuit and converts the voltage to output an output voltage and an output current. The output interface Electrically connect the voltage conversion circuit and receive the output Voltage and the output current, the control unit detects the input voltage, the input current, the output voltage, and the output current, calculates an input power related to a product of the input voltage and the input current, and an output power related to the output voltage The output power multiplied by the output current, and the conduction time between the input terminal and the output terminal is adjusted according to the value of the input power, and the non-conduction time between the input terminal and the output terminal is adjusted according to the value of the output power to obtain the best The input power and the output power.